To Know That We Know What We

If There Should Chance To Be Any Mathematicians Who, Ignorant In Mathematics Yet Pretending To Skill In That Science, Should Dare, Upon The Authority Of Some Passage Of Scripture Wrested To Their Purpose, To Condemn And Censure My Hypothesis, I Value Them Not, And Scorn Their Inconsiderate Judgement. De Revolutionibus Coelestibus

Therefore, Having Obtained The Opportunity From These Sources, I Too Began To Consider The Mobility Of The Earth.

Of All Things Visible, The Highest Is The Heaven Of The Fixed Stars.

So Far As Hypotheses Are Concerned, Let No One Expect Anything Certain From Astronomy, Which Cannot Furnish It, Lest He Accept As The Truth Ideas Conceived For Another Purpose, And Depart From This Study A Greater Fool Than When He Entered It.

We Are Taught All This [the Motion Of The Earth On Its Axis And Around The Sun] By The Order Of Succession, In Which Those Phenomena (various Planetary Happenings) Follow Each Other, And By The Harmony Of The World, If We Will Only, As The Saying Goes, Look At The Matter With Both Eyes.